When you're smiling, the whole world really does smile with you

From Sinatra to Katy Perry, celebrities have long sung about the power of a smile — how it picks you up, changes your outlook, and generally makes you feel better. But is it all smoke and mirrors, or is there a scientific backing to the claim? Groundbreaking research confirms that the act of smiling can trick your mind into being more positive, simply by moving your facial muscles.

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